SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e02ad871e69967ca524d564bafafb73c739fbd1e8358c61d98caf745ed5c610b' 
  AND token = 'hAl+TBYX1DxEJuD4FFg8DEJwgLvEEyiDnhsDAyB8xqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}